[Solved] What will be the output of this Ruby code?module M module_eval 'def shout; "Hey!"; end' end class C include M end puts C.new.shout | Ruby

Ruby - Advanced Metaprogramming

What will be the output of this Ruby code?

module M
  module_eval 'def shout; "Hey!"; end'
end

class C
  include M
end

puts C.new.shout

AHey

BNoMethodError

CRuntimeError

DHey!

Step-by-Step Solution

Solution:

Step 1: Analyze method definition with string in module_eval
The method shout is defined inside module M using a string passed to module_eval.
Step 2: Check class inclusion and method call
Class C includes M, so C.new.shout calls the method and prints "Hey!".
Final Answer:
Hey! -> Option D
Quick Check:
String eval method call = Hey! [OK]

Quick Trick: String code in module_eval defines methods usable after include [OK]

Common Mistakes:

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